Today's Message Index:
----------------------
1. 10:33 AM - FW: Batteries and fuel tank capacity (David Corbett)
2. 06:12 PM - Re: Fuel system - More Questions! (TheSchultzFamily)
3. 07:48 PM - Re: Fuel system - More Questions! (rparigor@suffolk.lib.ny.us)
4. 09:12 PM - Re: Fuel system - More Questions! (ofamerica.com YERLY)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | FW: Batteries and fuel tank capacity |
My Europa has a Hawker Energy SBS 30 battery mounted behind the baggage
bay. This battery has been in service for one year in the workshop, and
8.5 years flying, without any problem.
Has anyone ever had to replace a Hawker SBS 30 because of lack of
performance?
I noticed that Nigel Charles posted a message about fuel tank capacity.
I have just replaced the Avalec tank sender in "AM", and during the
re-calibration process I put 68 litres in, on top of the unusable fuel.
When I put the aircraft back from level flight position to the three
point position, I could see through the tank top surface, beside the
tank sender plate, that the tank was not full, and so put in three
further litres, making 71 litres and the unusable fuel. The tank was
still not full at that point, but I had no more fuel with me at that
stage. (To clarify, "AM" is a monowheel).
David
G-BZAM 560 hrs
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Fuel system - More Questions! |
Can anyone verify these "non" differential fuel pressure readings?
MP = 14.3 Fuel = 4.6
MP - 14 Fuel = 4.9
MP = 20 Fuel = 4.9
MP = 25 Fuel = 6.4
MP = 30 Fuel = 9.1
MP = 39.5 Fuel = 11.6
Engine seems to be running fine with these but earlier in the process the
engine was once again surging. Everyone that hears the surging thinks I have
a fuel problem????
Monitoring and testing continues...
Rich Schultz
N262AE
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Fuel system - More Questions! |
Hi Rich
"Can anyone verify these "non"
differential fuel pressure readings?"
"Non"
differential numbers are useless unless you know a lot more
information.
You need to know differential pressure going to
the carb float bowls over airbox pressure to help you figure if you have a
problem >>>>>>>>>>> period.
Measure airbox pressure in absolute terms and fuel pressure in absolute
terms and make sure fuel pressure is between 2 and 5 PSI over airbox
pressure.
Now when you start increasing MP tell us if it
ever falls below 2 PSI.
I guess if you really wanted to,
if you think your fuel pressure gauge is accurate, add to it the weight of
the air that is above you, then add an inch to MP pressure, now subtract
what your fuel pressure gauge is reading plus the air above you, from the
MP plus one inch. If you are between 2 and 5 PSI above with fuel pressure
you are OK. That is the verification you can do yourself.
Why
don't you just buy a differential transducer from UMA and either one of
their gauges or run one of yours from it? This way you can see if you have
a problem "RIGHT AWAY" when something is going on.
If
you take off and either overboost or something else has a problem, instead
of waiting for your motor to play silent night or slump, you can reduce MP
till you get at least 2 PSI and can be fairly sure you can maintain that
power setting.
If you fly a 914 IMHO you want differential
pressure information.
Ron Parigoris
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Fuel system - More Questions! |
Rich,
I'll run mine or Bakers tomorrow, weather permitting, and see what my
fuel pressure does. If memory serves, I start at 4 psi at idle and at
full throttle still see about 4 in line, and about 10.0 off the
regulator (my sender reads a little low). My gut feel is that regulated
fuel pressure is going up with manifold pressure as it should, but if
line pressure is going up to the regulator, that does not pass the
common sense test. On ground tests, the fuel pressure goes up as the
resistance goes up.
Example:
When I set up a fuel system, I disconnect the feed and pressure gauge
from the engine fuel regulator and pump fuel through the lines past a
direct reading pressure gauge (Tee'd to the aircrafts sender) and
through a valve to a gas can. This allows me to filter the system,
verify flow rates (by timing) and by closing off the valve, I can verify
the fuel pressure, the fuel flow decreases and the pressure goes up well
above 7 psi as I check flows and verify pressure readings. Note: These
readings are done before the regulator.
11.6 psi indicates a strong reduction in flow if reading prior to the
regulator, however if you are reading from the regulator, the regulated
pressure at full power 39.5 MP is about 5 psi boost, and 11.6 psi fuel
pressure is a tad high.
>From Page 9.2.3 of the Rotax maintenance manual, Fuel pressure =Airbox
pressure + 250hPa At takeoff performance the fuel pressure is going to
be about 700hPa or around . 7bar or about 10.15 psi
I'll talk to you after testing.
The shop took a lightning strike and power surge, so I have only one
shop phone left and it blew my shop computer, even with the surge
protectors. Pretty spectacular really. Snap crackle pop all in one. I
will be slow at answering emails for a few more days.
Bud
----- Original Message -----
From: TheSchultzFamily<mailto:Theschultzfamily@comcast.net>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Thursday, July 02, 2009 9:08 PM
Subject: RE: Europa-List: Fuel system - More Questions!
Can anyone verify these "non" differential fuel pressure readings?
MP = 14.3 Fuel = 4.6
MP - 14 Fuel = 4.9
MP = 20 Fuel = 4.9
MP = 25 Fuel = 6.4
MP = 30 Fuel = 9.1
MP = 39.5 Fuel = 11.6
Engine seems to be running fine with these but earlier in the process
the engine was once again surging. Everyone that hears the surging
thinks I have a fuel problem????
Monitoring and testing continues...
Rich Schultz
N262AE
http://www.matronics.com/Navigator?Europa-List<http://www.matronics.com/N
avigator?Europa-List>
http://www.matronics.com/contribution<http://www.matronics.com/contributi
on>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|